src/mesa/drivers/dri/i965/brw_cc.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keithw@vmware.com>
  30   */
  31
  32
  33 #include "brw_context.h"
  34 #include "brw_state.h"
  35 #include "brw_defines.h"
  36 #include "brw_util.h"
  37 #include "main/macros.h"
  38 #include "main/stencil.h"
  39 #include "intel_batchbuffer.h"
  40
  41 /**
  42  * Modify blend function to force destination alpha to 1.0
  43  *
  44  * If \c function specifies a blend function that uses destination alpha,
  45  * replace it with a function that hard-wires destination alpha to 1.0.  This
  46  * is used when rendering to xRGB targets.
  47  */
  48 GLenum
  49 brw_fix_xRGB_alpha(GLenum function)
  50 {
  51    switch (function) {
  52    case GL_DST_ALPHA:
  53       return GL_ONE;
  54
  55    case GL_ONE_MINUS_DST_ALPHA:
  56    case GL_SRC_ALPHA_SATURATE:
  57       return GL_ZERO;
  58    }
  59
  60    return function;
  61 }
  62
  63 /**
  64  * Creates a CC unit packet from the current blend state.
  65  */
  66 static void upload_cc_unit(struct brw_context *brw)
  67 {
  68    struct gl_context *ctx = &brw->ctx;
  69    struct brw_cc_unit_state *cc;
  70
  71    cc = brw_state_batch(brw, sizeof(*cc), 64, &brw->cc.state_offset);
  72    memset(cc, 0, sizeof(*cc));
  73
  74    /* _NEW_STENCIL | _NEW_BUFFERS */
  75    if (ctx->Stencil._Enabled) {
  76       const unsigned back = ctx->Stencil._BackFace;
  77
  78       cc->cc0.stencil_enable = 1;
  79       cc->cc0.stencil_func =
  80          intel_translate_compare_func(ctx->Stencil.Function[0]);
  81       cc->cc0.stencil_fail_op =
  82          intel_translate_stencil_op(ctx->Stencil.FailFunc[0]);
  83       cc->cc0.stencil_pass_depth_fail_op =
  84          intel_translate_stencil_op(ctx->Stencil.ZFailFunc[0]);
  85       cc->cc0.stencil_pass_depth_pass_op =
  86          intel_translate_stencil_op(ctx->Stencil.ZPassFunc[0]);
  87       cc->cc1.stencil_ref = _mesa_get_stencil_ref(ctx, 0);
  88       cc->cc1.stencil_write_mask = ctx->Stencil.WriteMask[0];
  89       cc->cc1.stencil_test_mask = ctx->Stencil.ValueMask[0];
  90
  91       if (ctx->Stencil._TestTwoSide) {
  92          cc->cc0.bf_stencil_enable = 1;
  93          cc->cc0.bf_stencil_func =
  94             intel_translate_compare_func(ctx->Stencil.Function[back]);
  95          cc->cc0.bf_stencil_fail_op =
  96             intel_translate_stencil_op(ctx->Stencil.FailFunc[back]);
  97          cc->cc0.bf_stencil_pass_depth_fail_op =
  98             intel_translate_stencil_op(ctx->Stencil.ZFailFunc[back]);
  99          cc->cc0.bf_stencil_pass_depth_pass_op =
 100             intel_translate_stencil_op(ctx->Stencil.ZPassFunc[back]);
 101          cc->cc1.bf_stencil_ref = _mesa_get_stencil_ref(ctx, back);
 102          cc->cc2.bf_stencil_write_mask = ctx->Stencil.WriteMask[back];
 103          cc->cc2.bf_stencil_test_mask = ctx->Stencil.ValueMask[back];
 104       }
 105
 106       /* Not really sure about this:
 107        */
 108       if (ctx->Stencil.WriteMask[0] ||
 109           (ctx->Stencil._TestTwoSide && ctx->Stencil.WriteMask[back]))
 110          cc->cc0.stencil_write_enable = 1;
 111    }
 112
 113    /* _NEW_COLOR */
 114    if (ctx->Color.ColorLogicOpEnabled && ctx->Color.LogicOp != GL_COPY) {
 115       cc->cc2.logicop_enable = 1;
 116       cc->cc5.logicop_func = intel_translate_logic_op(ctx->Color.LogicOp);
 117    } else if (ctx->Color.BlendEnabled && !ctx->Color._AdvancedBlendMode) {
 118       GLenum eqRGB = ctx->Color.Blend[0].EquationRGB;
 119       GLenum eqA = ctx->Color.Blend[0].EquationA;
 120       GLenum srcRGB = ctx->Color.Blend[0].SrcRGB;
 121       GLenum dstRGB = ctx->Color.Blend[0].DstRGB;
 122       GLenum srcA = ctx->Color.Blend[0].SrcA;
 123       GLenum dstA = ctx->Color.Blend[0].DstA;
 124
 125       /* If the renderbuffer is XRGB, we have to frob the blend function to
 126        * force the destination alpha to 1.0.  This means replacing GL_DST_ALPHA
 127        * with GL_ONE and GL_ONE_MINUS_DST_ALPHA with GL_ZERO.
 128        */
 129       if (ctx->DrawBuffer->Visual.alphaBits == 0) {
 130          srcRGB = brw_fix_xRGB_alpha(srcRGB);
 131          srcA   = brw_fix_xRGB_alpha(srcA);
 132          dstRGB = brw_fix_xRGB_alpha(dstRGB);
 133          dstA   = brw_fix_xRGB_alpha(dstA);
 134       }
 135
 136       if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
 137          srcRGB = dstRGB = GL_ONE;
 138       }
 139
 140       if (eqA == GL_MIN || eqA == GL_MAX) {
 141          srcA = dstA = GL_ONE;
 142       }
 143
 144       cc->cc6.dest_blend_factor = brw_translate_blend_factor(dstRGB);
 145       cc->cc6.src_blend_factor = brw_translate_blend_factor(srcRGB);
 146       cc->cc6.blend_function = brw_translate_blend_equation(eqRGB);
 147
 148       cc->cc5.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
 149       cc->cc5.ia_src_blend_factor = brw_translate_blend_factor(srcA);
 150       cc->cc5.ia_blend_function = brw_translate_blend_equation(eqA);
 151
 152       cc->cc3.blend_enable = 1;
 153       cc->cc3.ia_blend_enable = (srcA != srcRGB ||
 154                                 dstA != dstRGB ||
 155                                 eqA != eqRGB);
 156    }
 157
 158    /* _NEW_BUFFERS */
 159    if (ctx->Color.AlphaEnabled && ctx->DrawBuffer->_NumColorDrawBuffers <= 1) {
 160       cc->cc3.alpha_test = 1;
 161       cc->cc3.alpha_test_func =
 162          intel_translate_compare_func(ctx->Color.AlphaFunc);
 163       cc->cc3.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
 164
 165       UNCLAMPED_FLOAT_TO_UBYTE(cc->cc7.alpha_ref.ub[0], ctx->Color.AlphaRef);
 166    }
 167
 168    if (ctx->Color.DitherFlag) {
 169       cc->cc5.dither_enable = 1;
 170       cc->cc6.y_dither_offset = 0;
 171       cc->cc6.x_dither_offset = 0;
 172    }
 173
 174    /* _NEW_DEPTH */
 175    if (ctx->Depth.Test) {
 176       cc->cc2.depth_test = 1;
 177       cc->cc2.depth_test_function =
 178          intel_translate_compare_func(ctx->Depth.Func);
 179       cc->cc2.depth_write_enable = brw_depth_writes_enabled(brw);
 180    }
 181
 182    if (brw->stats_wm)
 183       cc->cc5.statistics_enable = 1;
 184
 185    /* BRW_NEW_CC_VP */
 186    cc->cc4.cc_viewport_state_offset = (brw->batch.bo->offset64 +
 187                                        brw->cc.vp_offset) >> 5; /* reloc */
 188
 189    brw->ctx.NewDriverState |= BRW_NEW_GEN4_UNIT_STATE;
 190
 191    /* Emit CC viewport relocation */
 192    brw_emit_reloc(&brw->batch,
 193                   (brw->cc.state_offset +
 194                    offsetof(struct brw_cc_unit_state, cc4)),
 195                   brw->batch.bo, brw->cc.vp_offset,
 196                   I915_GEM_DOMAIN_INSTRUCTION, 0);
 197 }
 198
 199 const struct brw_tracked_state brw_cc_unit = {
 200    .dirty = {
 201       .mesa = _NEW_BUFFERS |
 202               _NEW_COLOR |
 203               _NEW_DEPTH |
 204               _NEW_STENCIL,
 205       .brw = BRW_NEW_BATCH |
 206              BRW_NEW_BLORP |
 207              BRW_NEW_CC_VP |
 208              BRW_NEW_STATS_WM,
 209    },
 210    .emit = upload_cc_unit,
 211 };
 212
 213 static void upload_blend_constant_color(struct brw_context *brw)
 214 {
 215    struct gl_context *ctx = &brw->ctx;
 216
 217    BEGIN_BATCH(5);
 218    OUT_BATCH(_3DSTATE_BLEND_CONSTANT_COLOR << 16 | (5-2));
 219    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[0]);
 220    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[1]);
 221    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[2]);
 222    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[3]);
 223    ADVANCE_BATCH();
 224 }
 225
 226 const struct brw_tracked_state brw_blend_constant_color = {
 227    .dirty = {
 228       .mesa = _NEW_COLOR,
 229       .brw = BRW_NEW_CONTEXT |
 230              BRW_NEW_BLORP,
 231    },
 232    .emit = upload_blend_constant_color
 233 };